JPS61251007A - Engaging means - Google Patents

Abstract

PURPOSE:To obtain the titled engaging having magnetic shielding property at low cost by a method wherein a ferromagnetic metal film and a non-magnetic metal film are applied on the outer circumferential surface of a permanent magnet in a laminated form. CONSTITUTION:The ferromagnetic member 2 spliced on the pole-face (a) of a permanent magnet 1 with a hole 1a and the ferromagnetic member 3 which comes in contact with a pole-face (b) are constituted in such a manner that they are detachably attracted through the intermediary of the hole 1a of the permanent magnet 1. A ferromagnetic metal film 5 and a non-magnetic metal film 6 are applied in a laminated from at least on the pole-face (b) and the outer circumferential surface (c) of the permanent magnet 1. In the engaging means composed as above-mentioned, the ferromagnetic metal film 5 constitutes a magnetic path when the engaging means is in a non-engaged state, and as the lines of magnetic force leading to outside is reduced by a film 6, the breakage of record can be prevented even when a magnetic recording card and the like approaches. Also, as attracting force is concentrated in the center of the ferromagnetic member, the lowering of the attracting force can be prevented by the films 5 and 6.

Description

[Detailed Description of the Invention] (Field of Application) This invention relates to the improvement of an engaging tool using a permanent magnet, which omit the case and magnetic shielding plate, and has shape retention and magnetic shielding properties. This relates to braces.

(Prior art) As shown in FIG. 9, a conventional engagement tool using a permanent magnet consists of a permanent magnet 1 and a ferromagnetic member 2 attached to one of the magnetic pole faces a.
Generally, the permanent magnet 1 is covered with a non-magnetic metal case K, and the other magnetic pole face of the permanent magnet 1 is provided with a magnetic shielding plate to prevent trouble caused by the magnetic force coming out when disengaging the permanent magnet 1. Mome etc. with G attached are used.

(Problems to be Solved by the Invention) However, in the above-mentioned engagement tool, it takes time and effort to assemble the magnetic shield plate G to the case, and it is difficult to downsize the structure. Furthermore, there were other problems such as looseness easily occurring between each component and high cost.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides an engaging tool omitting a case and a magnetic shield plate, in which one magnetic pole surface a
A permanent magnet l having a hole 1a toward the other magnetic pole face.
An engagement in which the ferromagnetic member 2 attached to the magnetic pole face a of the permanent magnet 1 and the ferromagnetic member 3 abutting the magnetic pole face of the permanent magnet 1 are removably attracted via the hole 1a of the permanent magnet l. In this device, the co-magnetic pole face and the outer peripheral surface C of the permanent magnet 1 are coated in a laminated manner with a ferromagnetic metal coating WA5 and a non-magnetic metal coating 6 on the upper surface thereof.

(Function) When the engagement tool configured as described above is not engaged, the ferromagnetic metal sheath M5 constitutes a magnetic path, and part of the magnetism emitted from the magnetic pole face of the permanent magnet is collected on the sheath 5. , the other part also jumps out from the non-magnetic metal coating 6, but due to the magnetic properties of the non-magnetic metal coating 116, the magnetism that appears on the surface weakens in inverse proportion to the square of the distance. In the case of 800 gauss, the protrusion from the non-magnetic metal coating 6 is about 350 gauss, and the path of the magnetic lines of force becomes lower along the coating 6, so even if a magnetic recording card approaches, the recording will not be destroyed.

In addition, since the attraction force is concentrated at the center of the ferromagnetic member, the coating 5,
6 does not reduce the adsorption force.

(Effects) As described above, in the engaging tool according to the present invention, since the permanent magnet is covered with a ferromagnetic metal coating and a non-magnetic metal coating, the permanent magnet protrudes from the magnetic pole surface which is the open side when the permanent magnet is out of alignment. Magnetism passes through the ferromagnetic metal coating, and even if some of the magnetism escapes, it takes a path close to the coating, and is separated from the magnetic pole surface by the thickness of the non-magnetic metal coating, so it weakens in inverse proportion to the square of the distance. Therefore, even if a magnetic recording card such as a cash card or a recording tape approaches the engaging tool, the magnetic influence is weakened.

Magnetic recording will not be destroyed unless the magnetic pole surface is directly touched.

Further, since the magnetism of the attraction force of the engaging tool is concentrated on the protrusion at the center of the ferromagnetic member, the attraction force does not decrease during engagement.

Furthermore, since the permanent magnet is covered with two layers of metal coating, the permanent magnet is completely protected from cracking, chipping, and deformation, and the appearance is far superior to that of conventional cases.

Furthermore, there is no looseness between the permanent magnet, ferromagnetic member, magnetic shield plate, or between each component unlike with case coatings, and it is extremely easy to downsize and reduce costs. It has excellent effects.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

Fig. 1 shows an engaging tool, and shows a magnetic pole face a of a permanent magnet 1 having a hole 1a extending from one magnetic pole face a to the other magnetic pole face.
The ferromagnetic member 2 attached to the magnetic pole face and the ferromagnetic member 3 in contact with the magnetic pole face are configured to be removably attracted via the hole 1a of the permanent magnet 1, and the permanent magnet 1 is made of ferrite. ,
The ferromagnetic member 2 is made of a plastic magnet or the like.
The ferromagnetic member 2 has a protrusion 2a and a plate part 2b, and is fixed to the back surface of the attraction surface of the plate part 2b when caulking the two together. It has a fastening member 4 in the form of a washer with a leg piece, and is bent and fastened to the mounting board by the fastening member 4.

As shown in FIG. 2, the permanent magnet 1 has at least its magnetic pole face and outer peripheral surface C covered with a ferromagnetic metal coating IPJ5 and a non-magnetic metal coating 6 in a laminated manner. and 6 are each formed to have a thickness of several microns to several tens of microns.

The non-magnetic metal coating 6 is also said to have a hardness similar to that of true iron.

In FIG. 4, the protrusion 3a of the ferromagnetic member 3 of the engagement tool is not provided, and the protrusion 2a of the ferromagnetic member 2 is made long enough to reach the position facing the magnetic pole of the permanent magnet 1. The peripheral edge is provided perpendicularly to the suction surface to form an engaging edge 3c that prevents the suction position from shifting.

On the contrary, in FIG. 5, the protrusion 2a is not provided, and the protrusion 3a of the ferromagnetic member 3 is directly attracted to the plate portion 2b of the ferromagnetic member 2 when engaged, and its length is set. , the jacket member 4 on the side without the protrusion is welded. In FIG. 6, the magnetic pole face of the permanent magnet 1 is formed into a spherical concave surface, the plate portion 3b of the ferromagnetic member 3 is formed into a convex surface corresponding to the magnetic pole face, and the protruding portion 3a
The permanent magnet 1 can be smoothly fitted into the hole 1a.

In some cases, a magnetic shield plate is attached to the magnetic pole face and then covered with a ferromagnetic metal coating 5 and a non-magnetic metal coating 6 to provide complete magnetic shielding.

FIG. 7 shows various embodiments of the fastening member 4 of the engagement tool, (&) to (C) show pipe-shaped ones, (a) shows one with an open end, and (b) shows a closed end. (C) is an open pipe-shaped pipe whose other end is welded or soldered to the plate part 3b of the ferromagnetic member 3, for example. The other end is wound around the winding periphery of the washer and the washer is caulked to the ferromagnetic member 3, and both are pushed into holes made in the board for fixing the engaging tool and protrude from the board surface. In (a) and (C), fit a washer or the like to the protruding end, or spread it out in the circumferential direction without using a washer, and fix it by caulking, and fix it to the fixing board. Press a decorative button or a rod with a flange into the hole at the end that has been pushed into the opened hole and fasten it, or carve a female thread in the pipe and screw in a bolt with a flange, etc. (
In b), a fastener having a formed mounting pipe part is capped and pressed, and is formed in the mounting pipe part so as to be fixed. Part (e) in which the part 3a is extended to the back side and has a male thread carved thereon is a bottle-shaped example, and there are also cases where the part 3a is shaped like a pond thread, and it can be stopped by tightening a nut or inserting two screws. It is something to wear.

In FIG. 8, the plate portion 2b of the ferromagnetic member 2 is extended to one side to form a locking portion 2C having a locking hole 2d.

The plate portion 3b of the ferromagnetic member 3 is bent and a locking portion 3C is provided which is positioned on the same line as the plate portion 2b of the ferromagnetic member 2, and is suitable for use as a stopper for accessories. This is an example.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the engaging tool of the present invention, FIG. 2 is a partially enlarged sectional view of the same permanent magnet, and FIG. 3 is an explanatory diagram of the magnetic path in the same part when not engaged. 4 to 6 are sectional views of other embodiments of the engagement tool, FIG. 7 is a sectional view of various embodiments of the fastening member, and FIG. 8 is a sectional view of other embodiments of the engagement tool. 9 are sectional views of the conventional example. 1... Permanent magnet, 2.3... Ferromagnetic member, 4...
Fixing member, 5.6... Coating, a, b... Magnetic pole surface, C
...outer surface.

Claims (1)

[Claims] A ferromagnetic member 2 attached to a magnetic pole surface a of a permanent magnet 1 having a hole 1a extending from one magnetic pole surface a to the other magnetic pole surface b.
and a ferromagnetic member 3 that is in contact with the magnetic pole surface b of the permanent magnet 1 are removably attracted to each other through the hole 1a of the permanent magnet 1. and an engagement tool characterized in that the outer circumferential surface c is coated in a laminated manner with a ferromagnetic metal coating and a nonmagnetic metal coating on the upper surface thereof.